If you had enough free time to watch Red Letter Media destroy the latest Star Wars trilogy, then you have enough time to enjoy this 2-hour plus video entitled Kitbashed, a work-in-progress mashup of Star Wars with many of its sources of inspiration.
Michael Heilemann put this beast of a video together, and has explanations for his work at the video page.
I love sharing videos like this to aspiring filmmakers who think that people like George Lucas didn’t have any inspiration. Here you can see some films that helped Lucas craft the most influential sci-fi movie of all time.
May the force be with you.